Taking into account the rule of three, the volume that the pharmacy technician should give the patient is 3 mL.
In first place, the rule of three is a way of solving problems of proportionality between three known values and an unknown value, establishing a relationship of proportionality between all of them.
That is, what is intended with it is to find the fourth term of a proportion knowing the other three.
If the relationship between the magnitudes is direct, that is, when one magnitude increases, so does the other (or when one magnitude decreases, so does the other) , the direct rule of three must be applied.
To solve a direct rule of three, the following formula must be followed, being a, b and c known data and x the variable to be calculated:
a ⇒ b
c ⇒ x
So: [tex]x=\frac{cxb}{a}[/tex]
A physician orders a dosage of 1500mcg= 1.5 mg (being 1 mcg= 0.001 mg). The solution available is 0.5mg per ml.
So, the volume that the pharmacy technician should give the patient is calculated as:
0.5 mg ⇒ 1 mL
1.5 mg ⇒ volume
So: [tex]volume=\frac{1.5 mgx1 mL}{0.5 mg}[/tex]
volume= 3 mL
Finally, the volume that the pharmacy technician should give the patient is 3 mL.
Learn more with this example:
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